Our new motorsport history podcast And Colossally... That's History! marks the 30th anniversary of the deaths of Roland Ratzenberger and Ayrton Senna at Formula 1's 1994 San Marino Grand Prix this week with a three-part series.

Presenters Matt Bishop and Richard Williams - author of the outstanding The Death of Ayrton Senna - examine how F1 had evolved as a sport by 1994, both culturally and from a safety standpoint.

They explain how attitudes to injury and death had changed, but why at the same time a sense of complacency may have taken hold.

And, with the usual array of anecdotes and insight, they look specifically at 1994, and how a combination of rule changes, suspicion and back luck had left Senna in an uneasy frame of mind heading to Imola.